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| author | Marc-André Lureau <marcandre.lureau@redhat.com> | 2018-08-03 17:32:35 +0200 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2018-08-07 15:03:58 +0100 |
| commit | 93f874fe9dbe0b997b5a9459840957efd13d7191 (patch) | |
| tree | 44484b3c3f6d071bf7dce2548d3bfbc61802a805 /hw/display/virtio-vga.c | |
| parent | 09b94ac0f29db3b022a77a5aa50dc9e37032689d (diff) | |
| download | focaccia-qemu-93f874fe9dbe0b997b5a9459840957efd13d7191.tar.gz focaccia-qemu-93f874fe9dbe0b997b5a9459840957efd13d7191.zip | |
virtio-gpu: fix crashes upon warm reboot with vga mode
With vga=775 on the Linux command line a first boot of the VM running Linux works fine. After a warm reboot it crashes during Linux boot. Before that, valgrind points out bad memory write to console surface. The VGA code is not aware that virtio-gpu got a message surface scanout when the display is disabled. Let's reset VGA graphic mode when it is the case, so that a new display surface is created when doing further VGA operations. https://bugs.launchpad.net/qemu/+bug/1784900/ Reported-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Gerd Hoffmann <kraxel@redhat.com> Tested-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Message-id: 20180803153235.4134-1-marcandre.lureau@redhat.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/display/virtio-vga.c')
| -rw-r--r-- | hw/display/virtio-vga.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/hw/display/virtio-vga.c b/hw/display/virtio-vga.c index 8d3d9e14a7..701d980872 100644 --- a/hw/display/virtio-vga.c +++ b/hw/display/virtio-vga.c @@ -75,6 +75,16 @@ static void virtio_vga_gl_block(void *opaque, bool block) } } +static void virtio_vga_disable_scanout(VirtIOGPU *g, int scanout_id) +{ + VirtIOVGA *vvga = container_of(g, VirtIOVGA, vdev); + + if (scanout_id == 0) { + /* reset surface if needed */ + vvga->vga.graphic_mode = -1; + } +} + static const GraphicHwOps virtio_vga_ops = { .invalidate = virtio_vga_invalidate_display, .gfx_update = virtio_vga_update_display, @@ -156,6 +166,7 @@ static void virtio_vga_realize(VirtIOPCIProxy *vpci_dev, Error **errp) vvga->vga_mrs, true); vga->con = g->scanout[0].con; + g->disable_scanout = virtio_vga_disable_scanout; graphic_console_set_hwops(vga->con, &virtio_vga_ops, vvga); for (i = 0; i < g->conf.max_outputs; i++) { |